Finding the Fourth Proportional to 498.67, 688.17 and 291.67

Step by Step Solution

1. Step 1: Write the proportion equation
   498.67 : 688.17 = 291.67 : x
2. Step 2: Convert to fraction form
   498.67/688.17 = 291.67/x
3. Step 3: Cross multiply
   498.67x = 688.17 × 291.67
4. Step 4: Simplify right side
   498.67x = 200,718.54
5. Step 5: Solve for x
   x = 200,718.54/498.67
6. Step 6: Final answer
   x = 402.51